坐标J2000与J2000d的相互转换

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最新推荐文章于 2024-10-28 11:41:41 发布

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本文链接：https://blog.youkuaiyun.com/qq_19905867/article/details/119030480

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该博客介绍了3C279 Blazar的坐标转换过程，从J2000到J2000d，再从J2000d回转到J2000坐标系统。详细展示了小时、分钟、秒以及度、角分、角秒的计算方法，并给出了转换前后的具体数值。

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3C 279 – Blazar

CDS Portal

J2000 $\to$ J2000d

hour = 12
minutes = 56
seconds = 11.1664521013

degree = - 5
arcminutes = 47
arcseconds = 21.531840471


RA = (hour + minutes / 60. + seconds/3600.) * 15.
if degree > 0 :
    DEC = degree + (arcminutes / 60. + arcseconds / 3600.)
else :
    DEC = degree - (arcminutes / 60. + arcseconds / 3600.)

print(f'RA = {RA}   (deg)')
print(f'DEC = {DEC}   (deg)')

RA = 194.0465268837554 (deg)
DEC = -5.789314400130833 (deg)

J2000d $\to$ J2000

RA = 194.0465268837554 #(deg)
DEC = -5.789314400130833 #(deg)


hour = int(RA // 15.)
minutes = int(RA % 15. * 4.)
seconds = (RA % 15. * 4. - int(RA % 15. * 4.)) * 60

degree = int(DEC)
arcminutes = int((DEC - int(DEC)) * 60)
arcseconds = ((DEC - int(DEC)) * 60 - int((DEC - int(DEC)) * 60)) * 60

print(f'RA = {hour} : {minutes} : {seconds}   (hour : minutes : seconds)')
print(f'DEC = {degree} : {abs(arcminutes)} : {abs(arcseconds)}   (degree : arcminutes : arcseconds)')